Imaginary Picture of K2-25 b

Display orbital revolution of K2-25 b around the hoststar K2-25
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Exoplanet Name : K2-25 b
Alternate Name : "EPIC 210490365 b, 2MASS J04130560+1514520 b, EPIC 210490365
Radius (Rjup / Re): 0.3060 (Rjup) 3.4300 (Rearth)
Mass (Mjup / Me): 0.0771 (Mjup) 24.5130 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.0298 (AU Est.)
Eccentricity : 0.2700
Orbital Period(Yrs) 0.0095
Orbital Period(Observed/Estimated) 3.48 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 2.0836
Star Radiation at Atmospheric Boundary: 11896.9 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 466.1 (K)
Blackbody T 0.3(K) 437.7 (K)
Blackbody T 0.7(K) 354.2 (K)
Tidally Locked Blackbody T 0.1(K) 554.3 (K)
Tidally Locked Blackbody T 0.3(K) 520.6 (K)
Size Class: Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : K2-25
Alternate Name : "2MASS J04130560+1514520, EPIC 210490365, WISE J041305.70+151451.]UQ~.@n:)@
Star Distance(LY) : 146.8
Stellar Radius(Rsun) : 0.3 (Rsun Measured)
Stellar Mass(Msun) : 0.3 (Msun Measured) 0.3 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 3180 (K)
Spectral type : M4.5
UV portion[%]: 0.1
Visible portion[%]: 7.7
IR portion[%]: 92.1
Metalicity : 0.1
Absolute Magnitude: 12.6
Apparent Magnitude: 15.9
Right Ascension(RA) 63.2734
Declination (DEC) 15.2478
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Andrew W. Mann, Eric Gaidos, Gregory N. Mace, Marshall C. Johnson, Brendan P. Bowler, Daryll LaCourse, Thomas L. Jacobs, Andrew Vanderburg, Adam L. Kraus, Kyle F. Kaplan, Daniel T. Jaffe"
Discovery Paper - Title Zodiacal Exoplanets In Time (ZEIT) I: A Neptune-sized planet orbiting an M4.5 dwarf in the Hyades Star Cluster
Discovery Paper - Journal 0
Discovery Paper - URL 0
SIMBAD LINK
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/EPIC%20210490365%20b/
K2-25 b
K2-25 b

  • K2-25 b is an exoplanet orbiting the star K2-25, located about 146.8 light-years (45.0 pc) away from Solar System. Its discovery was publicly announced on 2015.
  • The host star K2-25 has apparent magnitude of 15.9, with absolute magnitude of 12.6.
  • It is 0.3 times more massive and 0.3 times bigger compared with our Sun. The surface temperature is 3180 with its spectral types of M4.5
  • In this planetary system, the extrasolar planet K2-25 b orbits around the star K2-25 every 3.5 days with its orbital distance of 0.03 AU ( 4454126.6 km)
  • (Projected orbit of K2-25 b around its host star K2-25)


  • The Star K2-25 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.064 AU ( 9504085.8 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.088 AU ( 13137130.4 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.134 AU ( 20018079.4 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.197 AU ( 29457480.8 km)
  • Radiation at Planetary Boundary of K2-25 b : 11896.93 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star K2-25)



  • Kopparapu Recent Venus for Star K2-25 distance : 0.072 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star K2-25 distance : 0.091 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star K2-25 distance : 0.088 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star K2-25 distance : 0.097 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-25 distance : 0.180 AU
  • Kopparapu Outer Boundary for Early Mars for Star K2-25 distance : 0.190 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star K2-25)



  • Original Kopparapu Recent Venus for Star K2-25 distance : 0.072 AU
  • Original Kopparapu Runaway Greenhouse for Star K2-25 distance : 0.094 AU
  • Original Kopparapu Moist Greenhouse for Star K2-25 distance : 0.095 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star K2-25 distance : 0.183 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star K2-25 distance : 0.190 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star K2-25)



    (Position in Stellar Map of star K2-25 and its Exoplanet K2-25 b)



    (Zoomed position in Stellar Map of star K2-25 and its Exoplanet K2-25 b (zoom level 3))

    (Synthetic Spectrum of star K2-25*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102